package com.mingdong.first.waiguan.hometheater;

public class Projector {

	private static Projector instance = null;
			
	private Projector(){
		
	}
	
	public static Projector getInstance(){
		
		if(instance == null){
			instance = new Projector();
		}
		return instance;
	}
	
	public void on(){
		System.out.println("Projector on");
	}
	
	public void off(){
		System.out.println("Projector off");
	}	
	
	public void focous(){
		System.out.println("Projector focous");
	}
	
	public void zoom(int size){
		System.out.println("Projector zoom size to"+ size);
	}	
}
